Equations - Bracketed division size

[Dan110024]

Word automatically resized the text size of one of my bracketed divisions in an equation and I can't work out how to make it do it again for the following equation. I want to do it again as it looks neater.

You can see the difference in the size between the two.

wordscreen.jpg

Even if I copy and paste the sensible heat removed equation, it still pastes it with a larger font for the bracketed division (shown in the latent heat removed equation).

I've tried all sorts of things to try to make it resize itself like it did initially, but nothing I've tried seems to work.